Apple's deal with Globalstar, say experts, is for terrestrial calls, not near-earth orbit calls.
From Sascha Segan:
My take: Segan, who heads up mobile coverage at PCMag, knows his stuff. Others have come to the same conclusion. See, for example, Robert Graham's "No, the iPhone 13 will not talk to satellites" and @spacanpanman's "Some thoughts on Kuo's iPhone 13 LEO connectivity rumors."